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Thermal Variation During Osteotomy With Different Dental Implant Drills: A Standardized Study in Bovine Ribs
Celso João Hochscheidt1, Roberto Hideo Shimizu, Augusto Ricardo Andrighetto
1*Master of Sciences in Implant Dentistry, Instituto Latino Americano de Pesquisa e Ensino Odontológico (ILAPEO), Curitiba, PR, Brazil; Technical Manager, Clínica Top Odontologia, Ponta Grossa, PR, Brazil. †Doctor of Sciences in Orthodontics, Universidade Estadual Paulista (UNESP), Araraquara, SP, Brazil; Coordinator, Master's Program in Orthodontics; Professor, ILAPEO, Curitiba, PR, Brazil. ‡Doctor of Sciences in Orthodontics, Universidade de São Paulo (USP), São Paulo, SP, Brazil; Professor, Graduate Programs in Orthodontics and Implant Dentistry, ILAPEO, Curitiba, PR, Brazil. §Docteur en Thermique et Energétique, Institut National des Sciences Appliquées de Lyon; Full Professor, Pontifícia Universidade Católica do Paraná (PUCPR), Curitiba, PR, Brazil. ¶Master of Sciences in Mechanical Engineering-Bioengineering, Pontifícia Universidade Católica do Paraná (PUCPR); Engineering Manager at Neodent Osseointegrated Implants, Curitiba, PR, Brazil. ‖Specialist in Implant Dentistry, Avantis, Balneário Camboriú, SC, Brazil; Partner in Clínica Top Odontologia, Ponta Grossa, PR, Brazil.
Introduction:
This study evaluated thermal variation (heat generation) by dental drills of similar geometries, made from different materials, during performance of 450 standardized osteotomies in bovine ribs to simulate implant site preparations.
Materials And Methods:
Each of the 3 groups-steel with a diamond-like carbon coating (SG), experimentally surface-treated steel (EG), and aluminum-toughened zirconium ceramic (ZG)-included 3 drills, distributed across 6 subgroups. An implant motor provided torque, rotation, and irrigation for 50% of subgroups.
Results:
In preparations drilled to 5 mm under irrigation, the number of osteotomies, material, and diameter did not influence thermal variation (ΔT); when drilling to 13 mm, the greatest ΔT occurred in EG (2.8°C). When drilling to 5 mm without irrigation, drill material influenced mean temperature; when drilling to 13 mm without irrigation, the greatest ΔT (5.5°C) occurred in EG. The highest temperature was observed in SG (79.6°C).
Conclusion:
After 50 uses, the greatest ΔT occurred in EG and the ∅3.0-mm drill exhibited the highest mean and peak temperatures. Temperatures were influenced by irrigation, number of uses, depth, drill diameter, geometry, and material; however, mean values were within physiological limits.
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